I think it might be useful to point out that none of these derailleurs shift by themselves….They all require operator input. While it may be fashionable to throw some shade on the older Campagnolo derailleurs, In my opinion they do (did) their jobs admirably. They do require a bit more finesse than a simple”push the lever slowly in the desired direction until the gear change occurs”, but that is just a relatively simple skill to be mastered. To criticize them while not having mastered that technique is a bit like claiming that the automatic transmission in a Ford Pinto is better than the 5 speed transmission in a Ferrari because the operator may not know how to use a manual transmission. I will also point out that shifting was but one job performed by a derailleur. A Campagnolo NR or SR rear derailleur (or a Simplex straight parallelogram model) facilitated a much easier and faster wheel change in a race than a Shimano or SunTour.